High Quality Material: The Outer Shell Of The Spring Center Punch Is Made Of High Carbon Steel, And The Built-In Spring Is Made Of Stainless Steel, Which Makes It Waterproof And Rustproof, Very Strong And Durable.The Tension Screw Allows You To Set The Best Tension For Your Work By Simply Turning The Knob. This Allows You To Control The Impact Pressure Of The Double Spring Shaft And Gives You The Correct Notch On The Materials You Are Using.Package Includes 2 Leather Punch Tools And 2 Spare Bits, Providing More Options For Your Job.Easy To Use: Easy One-Handed, Hammer-Free Operation. Anyone Who Only Has One Hand To Punch Will Not Want To Miss This Tool. You Will Find The Self-Scratching Center Punches To Be A Great Addition To The Home Toolbox.Versatile: The Self-Scratching Center Punch Can Be Used As A Manual Punch Tool On Wood, Metal, Glass; It Can Also Be Used To Break Car Windows So You Can Escape In An Emergency.